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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ed241a6d85e5597dcc74fa12cf72c0bcefffbc55403d8bc087794640283a39' 
  AND token = 'J2VhgCRNFZ72DtM+ovyNy9K0KeX0YW3b6A7I0kr5XYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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