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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0aa1cf8a537802b6d151dfa5c27e1246e632f5987865d7af511b90c4548a98c' 
  AND token = '0m7wamkm7QdBw2TiLxgsmM99Okd8py7LDfxGURzRCdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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