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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32620bb223e438a54ce2aae51ae6ab3f3979fe5a06ee2221a2605a2c0a96252' 
  AND token = 'ecA5T/ccNO07knp9zgwabZHP5TOm2ZQeBmbGweI9mCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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