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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4715be540033e1da04bed962a0abec815176406d3ce0b2d2f1f199aaf8532202' 
  AND token = 'F44PFBN7T3zilx0/3NTQBD75w1JUM/Np0I0ewfNmF4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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