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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65370a62851ed06c3bb318fb3d705c2e7147f5b8af925fbf320a68ff2f76d0a9' 
  AND token = '92+6HqdY3W6EakaAc+8+T67txU4wSxfsSxc6KSOm6D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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