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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43db26cdac8fa252e54e99e9d1554a148f59a3e47d2f39038d9eeae13b5243e' 
  AND token = 'O4dwmkzGnrCmwhRfJmHxeYH/rl7BE+y3bE8EZREdlSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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