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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48391c22f1f4e43b2999a86a288156682c4f8f6b54286ac562bb1404e8b2d15a' 
  AND token = 'N2fLWb9kYIAyH3you62Q1Fb9i6Nidp9EuckPiJJmep0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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