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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a683cc6723cd8ec245fdccbfc65dd883a22b2d10bd0b00d14204f168f32955' 
  AND token = '23COG5nxnedQ7qhOOP3h5yxN0Apvm9NKIyHg9M13fZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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