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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aefd52296b38bf19fced696e12f7d5bc272b0a45f9c7cea9dbbfc206fa4c6f7' 
  AND token = '0VPE1Wmlcfuszvu3icYbAxs1lgc16q6xosgePoPvJsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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