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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1d25bc7b963fc330a04ef584c4c612728bfa271740a70b1fc2126488a3200e' 
  AND token = 'zCzXnefwTYA89P4CJOyvzQnLsGhY/e77g8E+84vqa70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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