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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8909341b7ef7c1dd4be88885f0e3e34e0da8969c57d1d03165bb1e5e0476d8f0' 
  AND token = '55KYiz570TRN+OFTvh96p4LNevZWWCX1e0BInoZQa/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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