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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d37d2945d891cc3456de485b3f0391c614014e4028fc3bc0b6776f146aad5d' 
  AND token = 'gNX2LjxpoT5p0QdcfwGvbu4j7MSnZezQKmUh+QkSm04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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