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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d106945a1c810a5169d10a541c7d61f41de0ec90484e3f7cf3582feda898477' 
  AND token = 'vhRK7Mc5E+xd/tdCoL0SC7VUHywow29UMSQdMt15IFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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