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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2dedc13e26a1f7e31ad91aee6fee761e3e79e29e7194e4eccd471229b615a5' 
  AND token = 'Wl8qmJwoppcp1l9IelYbL9hdovUKN/6+9U4RjdzNKLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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