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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40030edb0d03df6147fe6c437a6bfd9e932ec140354f9bf54273386c1d3613ed' 
  AND token = 'ver7fUzYKHL9DR1CTEoPu+IcgMchHfG0+W4Ia5ihwm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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