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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b33d8326cddae453ad25b9572be68891a370a665b564bc13b3c635c2a17930c' 
  AND token = '6b6ND4K5L1vZSZpux3D8+mqa4wxy9GFOsNO5zhghAVM=' 
  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"
    }
  }
}