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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2db7d3a06d902fc68eebc96deb43386c01a805abd030d60a545eff48fd81d9' 
  AND token = 'Nla4KASlL6vMAwFJkz7tSuJHO+AA4c1pWt1ZxOV+uZs=' 
  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"
    }
  }
}