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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17317c054754b0bd26cdebf20fa3e9e9b2e8d3167c7e7b3e32c8ab0de4a131da' 
  AND token = '9W/zCGEN4mVSqRpq5kuN/X7Nftjrs1yKW06+0aalDJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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