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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a533e1e4d7dd84a9d5fbf0e2903951b4569357b1c7cc28bffd810bb856cbfc84' 
  AND token = 'u2j224TS98YTMI8G4XOIaivxkohhhw/QA3PHE/Oa5/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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