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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de12ee7ce91bb6cb8a1a7404edc060ce4a382936edffe325a9ac5d28f4346479' 
  AND token = 'aE5aMS2EleCsTjZVt5LfS4n6HLRxXYCj19+xd6t0ljQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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