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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9186940518f97a4f56b4c9593b1645fb0b7330fcaa950ad25e5bbf536f719b95' 
  AND token = 'tkAQAXjDxF2rRRf6KH4M0AszD7cZENHfaKx0g/Bzh8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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