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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8dc5a1eb68b45cb608f6205c02429a3762b845d4b2c8e6a2652c8354dce287' 
  AND token = 'niD5kCTKRiKGeKCRtuQ8hxfU8+nXX7mdiYxM+qsFvUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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