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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cddd450c7c2975705f6f4e8ee09a1633ba73f9dc04ede7eb4ce2a69b3a3683' 
  AND token = 'hDjie2G6dDefYHH64yy35VVjHVPbcIEqi3oHKlI8+Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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