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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9a0a6a8beef54a17c520bed1698f91a030e89701156c8618d169757c27a3e6' 
  AND token = 'OUNIBj3kcJ47gaDwr/eqlqYGTJHIKEhNa3/BaH84BQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}