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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3230bbf195f3f6aea77e873aeac2a23d0b5232dc32b64eeb2bed6de7c27e27b' 
  AND token = '2R4ElyDPdQ9/cKK6JHIiDeZcj+lpmSvqb686/zc7O+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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