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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400c68fa7aef660a6a8f601eed9fad2867ad2277f3eb84211cac48601155b5c7' 
  AND token = 'SEMczsz5bSf6JdqL1gJ09B5mP+240ch+lp7ZjD8zsiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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