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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc08a9cb5c5f6ab35da61da1ec6c0e52b4d93124274306d25a29af2d51cf3ac' 
  AND token = 'T+Zo/nZ7B1AEIgsPossAAplGR1FBzqn4Vw8HWeHDBEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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