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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c176278cc3313570fe3e4ddfdb0e5153bcf8df4d2fd59ae59008fc342c2bb9' 
  AND token = '/2hmGfDspUfreVlnY+awFff3hmMHdI1DfiZhZCg+bkQ=' 
  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"
    }
  }
}