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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1cf111c3cecb703422cb36ba99babb728a337c5d0ecc4a5ebb1923397d4d4fc' 
  AND token = 'nqVjzdAy/+OLNTwSP79LETwB39cNShMOol6g/j9cum0=' 
  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"
    }
  }
}