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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f8f71b5e2c9d2483d3419225c0a3a8f069bd37636e65cee4bd6f8edb44675e' 
  AND token = 'mKmAc+inaex0sLz6um8OaoKArE9vaZMLM/59gg1AToQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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