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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b65405a1112f53435dc7040107704c8b318375233c1d5874c208b3918f59db10' 
  AND token = 'i1e8OoRHaojtqMkBdtkVnfuWiRZyMi0e54YB9UbAOr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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