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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a5686d32cd6caff2a5e06c1f6467b1a5fba0e53a1c49bdab40915a6f2e67338' 
  AND token = 'mhCiiClIliL90N4GoEc2Q1K0jR8kZ9NBVGSmRzewhJU=' 
  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"
    }
  }
}