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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6377e1aa8708c2112c1e4142bbf714af40596e36dcfe70c85d664e44b5e92cc' 
  AND token = 'CKNm+IMD5I2gUCTS45T8HCAWXy7BsF2Qn1YNUW/ctWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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