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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28fc09ae6c988702681cb64314af9bfb04dffc9ac1d11c00dd8eeb3f06d05ca' 
  AND token = 'bM4Ag0IeFhkh6PpaG+Ml6tYuCBzUwSE4vBDjmam6aCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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