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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244e3d01234b2cf307fb2ca490aec6756e0930847ee1f828a8d6312ab2c84bff' 
  AND token = 'f7A9SraPmw/h5tIxDm1BwyuSKKNBR45FU739V37DEzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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