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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8749657fb31c1ce25285e6f7b738a75bc3d1f57ca89c10f6ddcee2a467234db1' 
  AND token = '1/z2bVR5sD/zFuVH/UVNBcHlWadmHmYLlYbi2iHS61s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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