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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5299a663c4674f598415875fd19076764c67bf35d93b9fc1ab3a6ad263b21c8' 
  AND token = 'fNBJ8kiRidypANgGkKWc2AS9ZOGO5hGVuNoY5dqcEks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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