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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86a9693d3a0849222936fbe9b32bdb98ffc75ddb3eba51184da7e48584b12f2' 
  AND token = 'X520W+trS5tFK7ozsMVtyR0EU+1AgF8GLjHGzyYcdf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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