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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215d0635574d1d9d649780e5fda6bd277431543ca9cf2a0b1d508a0785e48c7b' 
  AND token = 'v5+Vc204G/eC6BP401oArNPfgSq5HAiUapMixwmgu8k=' 
  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"
    }
  }
}