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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d6508f2129fad29458db4631a543fd0ec41d360112f2a17dc30e3ba3a1e5f5' 
  AND token = '0QrJvhrmr3RMhPvAt6xrgfnbdg7/9bpjdAMryS2dIng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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