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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94eed7e7072d21ea69220e2815d38c341f3aecbf8f1d404f163048812a48c68' 
  AND token = 'ttbEQqK2XRzR0tpNEQ49ns47UuwKIWYydteFUY8iZtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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