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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2229a1783ea2cd973c0247a32236875b4579596173736d1f411d3e6cd973dde' 
  AND token = 'U8Z93bJ6AcC5RiBd6T7cf70Tmb+/OZhov3qkoZcpkmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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