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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '374e3822c12d3346e343b0b3ed175d0e2eda0073f606f5dbfc9dcb57f7110757' 
  AND token = 'Ut3mFPDI6JgfTIurhz8N2XwwXaPk81uRmH1jUC0Srpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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