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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9317b477ab09eb7a9950e3a8e4b5a10350715e1039f5050aaf4fe7e50adf35fe' 
  AND token = 'iLVdXmugGawXNSdhte75G8zSlmBgj1Fbq4z2s5VRCKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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