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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1e39015a2a9c681188570221c15a400c4877495830b0ff252ef200eba582a6' 
  AND token = 'PBG69jRnt1umnJXOvnVm2bPFBfEiYX6CrhBUjf9KwT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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