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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11205f3ac2520e1f6e6744fbb280f32ab11ae31bb005ebcf9f090e353058e7b' 
  AND token = 'cZn+OKQdP1D3IMTlNhDKRsFMyGb+Tn0e1bytYlCoiXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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