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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e931c1bf06176968efa537d0cd5af29ea31544126943f493730a77d67761cc03' 
  AND token = 'UAwivdLFbbhKtK4Y2c9a+mTT3Ij2bYrVFS96aWLF6hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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