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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84ab813c35311b75819d15af49488b08aa8a4ffe8c11e5c99e624018b9a5b10' 
  AND token = '2Iq9bt2ScLs+sAS9S2fl9lQ4adIqpJpQMuhhwvPQlbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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